Go patch committed: Fix bug leading to invalid initializer loop report

[Ian Lance Taylor]

This patch by Chris Manghane fixes a bug in which gccgo could
incorrectly report an invalid initializer loop when a struct field name
is confused with a variable name.  This is http://golang.org/issue/7590.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline.

Ian

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